如何在httpmodule中执行XSLT转换?

我一直在尝试将服务器端的XSLT转换作为一个IISHttpModule来实现。我的基本方法是在BeginRequest安装一个新的过滤器,它将写入的内容转移到MemoryStream中,然后在PresentRequestContent中使用XSLT转换文档并将其写入原始输出流。但是,即使不执行转换,我也明显做了一些错误的事情,因为httpmodule似乎在第一页加载时工作,然后在重新启动应用程序池之前,服务器根本没有响应。转换到位后,我第一次得到一个空页面,然后没有响应。显然我在做一些愚蠢的事情,但这是我多年来编写的第一个C代码(也是我第一次尝试使用httpmodule),我不知道问题可能是什么。我犯了什么错误?(我已经对下面代码中的XSLT部分进行了注释,并取消了将缓存内容写入响应的行的注释。)

using System;
using System.IO;
using System.Text;
using System.Web;
using System.Xml;
using System.Xml.Xsl;

namespace Onyx {

    public class OnyxModule : IHttpModule {

        public String ModuleName {
            get { return "OnyxModule"; }
        }

        public void Dispose() {
        }

        public void Init(HttpApplication application) {

            application.BeginRequest += (sender, e) => {
                HttpResponse response = HttpContext.Current.Response;
                response.Filter = new CacheFilter(response.Filter);
                response.Buffer = true;
            };

            application.PreSendRequestContent += (sender, e) => {

                HttpResponse response = HttpContext.Current.Response;
                CacheFilter cache = (CacheFilter)response.Filter;

                response.Filter = cache.originalStream;
                response.Clear();

 /*               XmlReader xml = XmlReader.Create(new StreamReader(cache), new XmlReaderSettings() {
                    ProhibitDtd = false,
                    ConformanceLevel = ConformanceLevel.Auto
                });

                XmlWriter html = XmlWriter.Create(response.OutputStream, new XmlWriterSettings() {
                    ConformanceLevel = ConformanceLevel.Auto
                });

                XslCompiledTransform xslt = new XslCompiledTransform();
                xslt.Load("http://localhost/transformations/test_college.xsl", new XsltSettings() {
                    EnableDocumentFunction = true
                }, new XmlUrlResolver());
                xslt.Transform(xml, html); */

                response.Write(cache.ToString());

                response.Flush();

            };

        }


    }

    public class CacheFilter : MemoryStream {

        public Stream originalStream;
        private MemoryStream cacheStream;

        public CacheFilter(Stream stream) {
            originalStream = stream;
            cacheStream = new MemoryStream();
        }

        public override int Read(byte[] buffer, int offset, int count) {
            return cacheStream.Read(buffer, offset, count);
        }

        public override void Write(byte[] buffer, int offset, int count) {
            cacheStream.Write(buffer, offset, count);
        }

        public override bool CanRead {
            get { return cacheStream.CanRead; }
        }

        public override string ToString() {
            return Encoding.UTF8.GetString(cacheStream.ToArray());
        }

    }

}